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# Operating System
Operating System (OS) is usually a quite complex [program](program.md) that's typically installed on a [computer](computer.md) before any other user program and serves as a platform for running other programs as well as managing resources ([CPU](cpu.md) usage, [RAM](ram.md), [files](file.md), [network](network.md), ...) and offering services, protection and interfaces for humans and programs. As with most things, the definition of an OS can differ and be stretched greatly -- while a typical OS will include features such as [graphical interface](gui.md) with windows and mouse cursor, [file system](file_system.md), [multitasking](multitasking.md), [networking](network.md), [audio](audio.md) system, safety mechanisms or user accounts, there exist OSes that work without any said feature. Though common on mainstream computers, operating system isn't necessary; it may be replaced by a much simpler program (something akin a program loader, BIOS etc.) or even be absent altogether -- programs that run without operating system are called "[bare metal](bare_metal.md)" programs (these can be encountered on many simple computers such as [embedded](embedded.md) devices).
Operating System (OS) is usually a quite complex [program](program.md) that's typically installed on a [computer](computer.md) before any other user program and serves as a platform for running other programs as well as handling [low level](low_level.md) functions, managing resources ([CPU](cpu.md) usage, [RAM](ram.md), [files](file.md), [network](network.md), ...) and offering services, protection and [interfaces](interface.md) for humans and programs. If computer was a city, an OS is its center that was built first and where its government resides. As with most things, the definition of an OS can differ and be stretched greatly -- while a typical OS will include features such as [graphical interface](gui.md) with windows and mouse cursor, [file system](file_system.md), [multitasking](multitasking.md), [networking](network.md), [audio](audio.md) system, safety mechanisms or user accounts, there exist OSes that work without any said feature. Though common on mainstream computers, operating system isn't necessary; it may be replaced by a much simpler program (something akin a program loader, BIOS etc.) or even be absent altogether -- programs that run without operating system are called "[bare metal](bare_metal.md)" programs (these can be encountered on many simple computers such as [embedded](embedded.md) devices).
There is a nice [CC0](cc0.md) wiki for OS development at https://wiki.osdev.org/.